The Steele Rubber Products 1" Bulb Seal is typically found on the inside edge of the slide-out outer wall. It slides into a track and seals against the camper wall or slide-out wiper when the slide-out is retracted. The unique profile design helps prevent side-flop when compressed and allows for greater surface contact. This 1" bulb seal is an excellent replacement for Thor Citation RVs. It's commonly paired with the 3" Peel-N-Stick Wiper Seal, 3-1/2" Peel-N-Stick Wiper Seal, and 4-1/16" Peel-N-Stick Wiper Seal. 30' long. Helps prevent side-flop when compressed Allows for greater surface contact 30' long | Steele Rubber Products 1" Bulb Seal, 30' long